Fetching JSON data in React Native can be done by utilizing the fetch function. By making use

Question

Fetching JSON data in React Native can be done by utilizing the fetch function. By making use

Currently, I am in the process of developing a small iPhone application using React Native. My main goal is to fetch JSON data from a specific website by utilizing the fetch method. An example of my code is shown below:


function status(response) {
  if (response.status >= 200 && response.status < 300) {
    return response
  }
  throw new Error(response.statusText)
}

function json(response) {
  return response.json()
}


fetch('/users', {
  method: 'post',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'Hubot',
    login: 'hubot',
  })
}).then(status)
  .then(json)
  .then(function(json) {
    console.log('request succeeded with json response', json)
  }).catch(function(error) {
    console.log('request failed', error)
})

While everything seems to be working fine with fetching and handling the data, my challenge lies in storing this data for later use. Whenever I attempt to assign the fetched data to a variable within the json function, I encounter a "Request error" before eventually obtaining the data correctly. What would be the best approach to retrieve this data and store it in a variable for future usage?

javascript ios json react-native fetch-api

Answer 1

Answer №1

Here is the approach I took. I outputted the response to the console. You have the option to save the response data in either your state variable or local storage according to your preference.

  doRegistration() {

     console.log("executing POST API");
     fetch('your API URL', {
     method: 'POST',
     headers: {
                  'Accept': 'application/json',
                  'Content-Type': 'application/json',

                },


      body: JSON.stringify({
      password: this.state.password,
      email:this.state.email,
      name: this.state.firstname,
      last_name :this.state.last_name,
      mobile:this.state.mobile,
      ssn:"2222222"

     })
      }).then((response) => response.json())
        .then((responseData) => {
                                 console.log("handling responsejson");
                                 console.log('the response object:',responseData)

         }).done();
     }

Answer 2

Here is the approach I took. I outputted the response to the console. You have the option to save the response data in either your state variable or local storage according to your preference.

  doRegistration() {

     console.log("executing POST API");
     fetch('your API URL', {
     method: 'POST',
     headers: {
                  'Accept': 'application/json',
                  'Content-Type': 'application/json',

                },


      body: JSON.stringify({
      password: this.state.password,
      email:this.state.email,
      name: this.state.firstname,
      last_name :this.state.last_name,
      mobile:this.state.mobile,
      ssn:"2222222"

     })
      }).then((response) => response.json())
        .then((responseData) => {
                                 console.log("handling responsejson");
                                 console.log('the response object:',responseData)

         }).done();
     }

Answer 3

Answer №2

To define a variable within the constructor of a component, you can follow this code snippet:

constructor(props) {
    super(props);
    this.state = {
       data: ''
    }
}

You can then update this variable as needed by using the following code:

 .then((responseData) => {
    this.setState({
      data: responseData
    });
  })

Answer 4

To define a variable within the constructor of a component, you can follow this code snippet:

constructor(props) {
    super(props);
    this.state = {
       data: ''
    }
}

You can then update this variable as needed by using the following code:

 .then((responseData) => {
    this.setState({
      data: responseData
    });
  })

Answer 5

Answer №3

Initially, it's important to note that every request comes with a header and a body

When utilizing the fetch function, a default response includes the headers of the request. To access the body of the request, simply use response.json()

return fetch(url,{
  method: 'POST',//GET and ...
  headers:{
      Accept: 'application/json',
      'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      elm: "elm" //is fake
  })
 })
 .then((response)=>response.json()) //   <------ this line 
 .then((response)=>{
   return response ;
 });

If the body of your request is in the format of html dom, you can retrieve it by using response.text()

Furthermore, if you wish to retrieve the header only, simply add this line

.then((response)=>response.json())

Answer 6

Initially, it's important to note that every request comes with a header and a body

When utilizing the fetch function, a default response includes the headers of the request. To access the body of the request, simply use response.json()

return fetch(url,{
  method: 'POST',//GET and ...
  headers:{
      Accept: 'application/json',
      'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      elm: "elm" //is fake
  })
 })
 .then((response)=>response.json()) //   <------ this line 
 .then((response)=>{
   return response ;
 });

If the body of your request is in the format of html dom, you can retrieve it by using response.text()

Furthermore, if you wish to retrieve the header only, simply add this line

.then((response)=>response.json())

Answer 7

Answer №4

When I implemented authentication in my project, I opted for using sails.js with passport local. The process is quite similar across different node.js frameworks. To retrieve the variables needed for signing in, I created a function(req,res) where the variables were stored in req.body. For example, in your situation, req.body.name would hold 'Hubot' and req.body.login would hold 'hubot'. The response was then sent using res.send. It's advisable to refer to the node.js documentation for further insights.

Answer 8

When I implemented authentication in my project, I opted for using sails.js with passport local. The process is quite similar across different node.js frameworks. To retrieve the variables needed for signing in, I created a function(req,res) where the variables were stored in req.body. For example, in your situation, req.body.name would hold 'Hubot' and req.body.login would hold 'hubot'. The response was then sent using res.send. It's advisable to refer to the node.js documentation for further insights.

Answer 9

Answer №5

Everyday I strive to create

This is a simple button

<Button onPress={this._onPressButton} accessibilityLabel="tap!!!" />

This is my reaction

  _onPressButton() {

  return fetch('https://facebook.github.io/react-native/movies.json')
    .then((response) => response.json())
    .then((responseJson) => {
      console.log(responseJson.movies);
    })
    .catch((error) => {
      console.error(error);
    });

  }

The outcome

[14:30:19] Array [
[14:30:19]   Object {
[14:30:19]     "id": "1",
[14:30:19]     "releaseYear": "1977",
[14:30:19]     "title": "Star Wars",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "2",
[14:30:19]     "releaseYear": "1985",
[14:30:19]     "title": "Back to the Future",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "3",
[14:30:19]     "releaseYear": "1999",
[14:30:19]     "title": "The Matrix",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "4",
[14:30:19]     "releaseYear": "2010",
[14:30:19]     "title": "Inception",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "5",
[14:30:19]     "releaseYear": "2014",
[14:30:19]     "title": "Interstellar",
[14:30:19]   },
[14:30:19] ]
[14:30:19] Array [
[14:30:19]   Object {
[14:30:19]     "id": "1",
[14:30:19]     "releaseYear": "1977",
[14:30:19]     "title": "Star Wars",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "2",
[14:30:19]     "releaseYear": "1985",
[14:30:19]     "title": "Back to the Future",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "3",
[14:30:19]     "releaseYear": "1999",
[14:30:19]     "title": "The Matrix",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "4",
[14:30:19]     "releaseYear": "2010",
[14:30:19]     "title": "Inception",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "5",
[14:30:19]     "releaseYear": "2014",
[14:30:19]     "title": "Interstellar",
[14:30:19]   },
[14:30:19] ]

Answer 10

Everyday I strive to create

This is a simple button

<Button onPress={this._onPressButton} accessibilityLabel="tap!!!" />

This is my reaction

  _onPressButton() {

  return fetch('https://facebook.github.io/react-native/movies.json')
    .then((response) => response.json())
    .then((responseJson) => {
      console.log(responseJson.movies);
    })
    .catch((error) => {
      console.error(error);
    });

  }

The outcome

[14:30:19] Array [
[14:30:19]   Object {
[14:30:19]     "id": "1",
[14:30:19]     "releaseYear": "1977",
[14:30:19]     "title": "Star Wars",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "2",
[14:30:19]     "releaseYear": "1985",
[14:30:19]     "title": "Back to the Future",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "3",
[14:30:19]     "releaseYear": "1999",
[14:30:19]     "title": "The Matrix",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "4",
[14:30:19]     "releaseYear": "2010",
[14:30:19]     "title": "Inception",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "5",
[14:30:19]     "releaseYear": "2014",
[14:30:19]     "title": "Interstellar",
[14:30:19]   },
[14:30:19] ]
[14:30:19] Array [
[14:30:19]   Object {
[14:30:19]     "id": "1",
[14:30:19]     "releaseYear": "1977",
[14:30:19]     "title": "Star Wars",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "2",
[14:30:19]     "releaseYear": "1985",
[14:30:19]     "title": "Back to the Future",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "3",
[14:30:19]     "releaseYear": "1999",
[14:30:19]     "title": "The Matrix",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "4",
[14:30:19]     "releaseYear": "2010",
[14:30:19]     "title": "Inception",
[14:30:19]   },
[14:30:19]   Object {
[14:30:19]     "id": "5",
[14:30:19]     "releaseYear": "2014",
[14:30:19]     "title": "Interstellar",
[14:30:19]   },
[14:30:19] ]

Fetching JSON data in React Native can be done by utilizing the fetch function. By making use

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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